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An observer in a reference frame can describe motion using position, displacement, distance, velocity, speed and:
AAcceleration
BTemperature
CLuminosity
DConductivity
Answer & Solution
Correct answer: A. Acceleration
1. Kinematics has a standard list of descriptive quantities.
2. An observer describes motion within a particular reference frame.
3. The quantities are position, displacement, distance, velocity and speed.
4. Acceleration completes the list.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 2 'Kinematics', sections 2.1-2.8_
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